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=pod
=encoding utf-8
=head1 PURPOSE
Tests L<Types::Standard> cannot be added to!
=head1 AUTHOR
Toby Inkster.
=head1 COPYRIGHT AND LICENCE
This software is copyright (c) 2022-2023 by Toby Inkster.
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.
=cut
use strict;
use warnings FATAL => 'all';
use Test::More;
use Test::Fatal;
use Types::Standard;
my $e = exception {
Types::Standard->add_type( { name => 'Boomerang' } );
};
like $e, qr/Type library is immutable/;
done_testing;
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